High-frequency signaling system



Aug. 28, 1923. 1.466263 E. F. W. ALEXANDERSON HIGH FREQUENCY SIGNALINGSYSTEM Filed April 10 1922' 3 1 WNW 3 AP' His A'C'Cor'qfay Patented Aug.28, 1923.

ire states titans ERNST F. W. ALEXANDERSON, OF SCHENECTADY, NEW YORK,ASSIGNOR TO GENERAL 7 ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

nronrnnennncv srenemne SYSTEM.

Application filed April 10, 1922. Serial No. 550,948.

To all whom it may concern:

Be it known that I, ERNST F. W. ALEX- ANDERSON, a citizen of the UnitedStates, residing at Schenectady, in the county of Schenectady State ofNew York, have invented certain new and useful Improvements inHigh-Frequency Signaling Systoms, of which the following is aspecification.

My present invention relates to high-frequency signaling systems andmore particularly to systems for producing interrupted continuous highfrequency signalingfcurrents. l

The object of my invention is to provide a simple and eiiicient methodand apparatus 7 for producing interrupted continuous waves which will beparticularly adapted for effective transmission of radio telegraphicsignals.

In carrying my invention into effect, I employ an electrondischargedevice of the well known three electrode type and arrange thisin-such a way that it will be capable of producing oscillations of bothaudio and radio frequency. The apparatus is further adjustedand'arranged in such a way that high frequency oscillations will beproduced only during a portion of each cycle of the audio frequencyoscillal'atus the high frequency oscillations produced may be made ofsubstantially constant amplitude during the period when they are beingproduced, High frequency oscillations produced in accordance with myinvention because of the fact that they have a high decrement are moreetlicient for the transmission of signals than modulated high frequencyoscillations such as have been produced in ways heretofore proposed forproducing modulated high frequency oscil-' lations bywaves ofan"electron discharge device.

The novel features which I believe to be characteristic of my inventionare set forth with particularity in the appended cla ms,-

my invention itself however both as to its organization and mcthoduofoperation will best be understood by reference to the followingdescription taken'in connection with istics By proper adjustment of theappa-' the accompanying drawing in which I have indicateddiagrammatically one way of 'carrying'my invention into effect.

I have indicated in the drawing an electron discharge dcvlce 1 of theusual threeelectrode" type. A supply circuit which in cludes a source ofcurrent 2 and inductances 3 and L is connected between the cathode 5 andanode 6. A highfrequency oscillating circuit associated with the device1 comprises an inductance 7 in circuit with the" 12. The grid circuitalso includes a low frequency oscillating circuit made'up of capacity 13and inductance 1 1, "which is" It will be apparent that with thearrange-' mentdcscribed when so adjusted as to produce low frequencyoscillations the potential of the grid varies at the audio frequency'ofthe low frequency oscillations generated. character- If the device hassuitable or the normal grid potential is adjusted to the proper valuehigh frequency oscillations will be produced only during a portion ofeach cycle of the low frequency oscillations, I by suitable adjustmentbe made to be all of the positive half cycle, a part only of thepositive half cycle.v or all of the positive half cycle and part of thenegative.

point at which high frequency oscillations start may be made quitecritical and the high frequency 'OSClllltlOflS will quickly build up totheir maximum amplitudeand continue at substantially constant amplitudeduring theentire period during which they are produced. A high frequencywave- I am aware that it has heretofore been proposed to producemodulated high frequency oscillations by means of a single'electron'discharge device. In none of the This 7 portion may lVith thearrangement which I have described the Cir systems which have beenproposed for this purpose of Which- I am aware, however, have any meansbeen provided for limiting the amplitude of the audio frequencyoscillations in proportion to the amplitudeof the radio frequencyoscillations and there has been a general tendency in such systems forthe audio frequency oscillations to rise in.

amplitude at the expense of the high fre quency oscillations. In thesystem which I havedescribed, however, .it is apparent that theamplitude of the audio frequency oscil lations will be limited bytheamplitude of the radio frequency oscillations as the am plitude'of' theaudio frequency oscillations is entirely dependent upon the amount ofenergy which is supplied to the tube and the greater part of this energyis converted into high frequency oscillations.

l/Vhi-le I have shown and described the preferred embodiment of myinvention it is apparent that many modifications in the circuitarrangement employed for carrying out my invention may be made withoutde parting from the-scope of. my invention as set forth in the appendedclaims.

What I claim as new and desire to secure by Letters Patent of the UnitedStates, is

1. Av system for producing interrupted continuous Waves comprising anelectron discharge device having a cathode, an anode, andia grid, asupply circuit connectingthe cathode and anode-and containing a sourceof current, a high frequency oscillating circuit in shunt to said supplycircuit and coupled by capacity to a grid circuit, and a I of current, aradiating antenna,

quency oscillating circuit associated with a low frequency oscillatingcircuit associated with the grid circuit and inductively coupled to thesupply circuit.

2. A system for producing continuous waves comprising interrupted anelectron discharge device having a cathode, an anode and a grid, asupply circuit connecting the cathode and anode and containing a sourcea high frothe cathode and anode independent of said supply circuit, andwith said antenna and coupled by capacity to a grid circu t and a lowfrequency oscillating circuit associated 4 with the grid circuit andinductively cou- 1 low frequency oscillations.

pled to the supply circuit.

3. The'rnethodof producing interrupted continuous waves by means of anelectron discharge device which consists in generating low frequencycontinuous oscillations by means of said device and generating highfrequency oscillations during the positive portions only of theindividual cycles of the 4. The method of producing an electron ingeneratillations by discharge device. which consis s, i-ng low frequenccontinuous means or said dc interrupted as ria frequency oscillationsduring a portion only of each individual cycle of the low frequencyoscillations.

5. The method of producing interrupted continuous waves by means of anelectron discharge device which consists in generating low frequencycontinuous oscillations by means of said device and generating h ghfrequency oscillations during a portion only c discharge oscillationgenerator which, consistsin generating both high frequency and lowfrequency oscillations thereby.- and limiting the amplitude of the lowfrequency oscillations by the amplitude ofthe high frequencyoscillations.

.- 7]. The method of; operating an electron discharge oscillationgenerator which con-.

sists. in generating high frequency oscillations thereby andgeneratinglow frequency oscillations thereby which are limitedinamplitude by the amplitude'of the high frequency oscillations.

8. A system for producing interrupted? continuous waves comprising an.electron discharge device having a cathode, an anode and. a grid, asupply circuit connecting the cathodeand anode and containing a sourceduring the PGIIOClS' of current, a high frequency oscillating cir-(-iiit in shunt to said supply circuit, a grid circuit, and a lowfrequency oscillating circuit associated-withthe grid circuit andinductively coupled to the supply circuit.

9.1%, system for producing interruptedcontinuous waves comprising anelectron discharge device having a cathode, an anode and a grid, asupplycircuitconnecting the cathode and anode and containing a sourceoiicurrent, a radiating antenna, a high he quencyoscillatingcircuitassociated with the cathode and anode independent of said supplycircuit, and with said antenna, av grid circuit and a low frequencyoscillating ciruit associated with the grid circuit and inductivelycoupledto the-supply circuit.

10. ii system. for producing high frequency oscillations coiuprising anelectron discharge device having a cathode, an anode and a grid, asupply circuit connectingthe:

cathode and anode, a high frequencyosrillating circuit associated withsaid device in such a Way that high frequency oscillations will beproduced therein, and low frequency oscillatingcircuit associated with.said supply circuit n such a Way that low frequency oscillations wilhbeproduced therein of an amplitudeproportional 'to the energy supplied tothedevice.v

ii; A s stem for producing highquency; 939 i"i.iiiinfiiiiilfil)ii"i31g"; an

iven free discharge device having a cathode, an anode frequencyoscillations will be produced and a grid, a supply circuit connectingthe therein of an amplitude proportional to the 10 cathode and anode, ahigh frequency oscilamplitude of the high frequency oscillations latingcircuit associated with said device in produced.

- such a Way that high frequency oscillations In Witness whereof, I havehereunto set Will be produced therein, and a low fre my hand this 8thday of April, 1922. quency oscillating circuit associated With saidsupply circuit in such a Way that low ERNST F. ALEXANDERSON.

